The Clean Air Initiative web site provides general information
on air quality monitoring and data and describes the components
that are essential to the establishment of an air quality monitoring
and assessment program. Links are included for the World Health
Organization's (WHO's) information manuals on what to monitor, where
to monitor, and how to monitor. The site also provides a link to
the Air Management Information System (AMIS), a global air quality
information exchange system that WHO developed, which comprises
air pollution data from about 100 cities in 40 countries.

The Co-operative Programme for Monitoring and Evaluation of the
Long-Range Transmission of Air Pollutants in Europe (EMEP) site
links to ambient monitoring data from approximately 40 countries
in the EMEP network in Europe with time series of daily values and
monthly and annual means from 1977 to 2000 for ozone data and data
on acidification/eutrophication in air and precipitation.

This Norwegian Institute for Air Research report outlines the
monitoring strategy and the detailed monitoring requirements of
the Co-operative Programme for Monitoring and Evaluation of the
Long-Range Transmission of Air Pollutants in Europe (EMEP) for the
period 2004-2009. The report includes a section on available monitoring
methods and new techniques.

The National Ambient Air Quality Monitoring (NAAQM) network in
India is comprised of 290 stations covering over 90 towns/cities
that are distributed over 24 States and 4 Union Territories. The
pollutants monitored are sulfur dioxide (SO2), nitrogen
dioxide (NO2), and suspended particulate matter (SPM). From this
Central Pollution Control Board page, links are provided for data,
which can be obtained via location (i.e., residential, industrial
or sensitive) or can be viewed via ambient air quality trends.

This August 2001 manual shows the analytical methods used
to determine levels of dioxins in samples taken from the ambient
air. It does not strictly define certain analytical techniques
since new technology moves at a rapid pace. Analysts are free
to adopt the method most suitable to their conditions.

This guide contains information on ambient air quality monitoring and how to look after and present monitoring data once it is collected. It recommends a process for developing a regional air quality monitoring program, discusses and recommends monitoring methods, describes basic quality assurance procedures and recommends ways to present data clearly and effectively.

This document summarizes Singapore's ambient air quality monitoring network, methods of measurement, ambient air quality standards (based on the U.S. EPA standards and WHO goals), pollutant standards index, and general air quality trends in Singapore. Air quality monitoring in Singapore was fully automated with the commissioning of the telemetric air quality monitoring and management system (TAQMMS) in 1994.

The UK National Air Quality Information Archive provides
real-time pollutant data for the region (from the Home
page), and a database containing tables of measured
concentration data and statistics (from 1960 until present)
from the monitoring networks operated on behalf of the
DEFRA and the devolved administrations (see the Data
and Statistics tab). The monitoring data are collected
via two methods: Automatic Networks, which produce hourly
pollutant concentrations with data being collected from
individual sites by modem, and Non-automatic Networks,
which measure less frequently - either daily, weekly
or monthly - and samples are collected by some physical
means (such as diffusion tube or filter).

The Air Quality System (AQS) contains very detailed
ambient air quality data (e.g., hourly measurements),
as well as meteorological data, collected by EPA, state,
local, and tribal air pollution control agencies from
thousands of monitoring stations. [Note that summary
information (e.g., daily or yearly means, or peak concentrations)
is available from the EPA AirData website at http://www.epa.gov/air/data/index.html].
AQS was reengineered from a mainframe application to
a personal computer (PC)-based application as of January
2002 and data are submitted directly to AQS via this
client/server application. Currently, registered users
may retrieve data through the AQS application and through
the use of third party software; however, data should
be more accessible in the near future directly from
the AQS site.

The Ambient Monitoring Technology Information Center
(AMTIC) contains information, links, and files on ambient
air quality monitoring programs (e.g., maps of the national
monitoring networks), details on monitoring methods,
numerous documents on monitoring, information on air
quality trends and non-attainment areas (e.g., links
to the National Air Quality and Emissions Trends Report
and EPA's Green Book), and federal regulations related
to ambient air quality monitoring.

Continuous emissions monitoring (CEM) is the continuous
measurement of pollutants emitted into the atmosphere
in exhaust gases from combustion or industrial processes.
EPA has established requirements for the continuous
monitoring of sulfur dioxide (SO2), volumetric
flow, nitrogen oxides (NOx), diluent gas,
and opacity for units regulated under the Acid Rain
Program. This site provides information on CEM, including
the monitoring requirements, quality assurance, and
recordkeeping/reporting.

A continuous emission monitoring system (CEMS) is
the total equipment necessary for the determination
of a gas or particulate matter concentration or emission
rate, and is required under some of the EPA regulations
for either continual compliance determination or determination
of exceedances of the standards. This site provides
links to information and guidance documents related
to criteria and non-criteria pollutants and sources
(e.g., municipal waste Combustors, industrial furnaces)
for CEMS.

The Emission Measurement Center (EMC) within the EPA
develops methods of measuring air pollutants emitted
from the entire spectrum of industrial processes causing
air pollution. EMC is responsible for methods for New
Source Performance Standards (NSPSs), National Emission
Standards for Hazardous Air Pollutants (NESHAPs), State
Implementation Plans (SIPs), and the Maximum Achievable
Control Technology (MACT) standards. This page has links
to summaries for the above listed test methods.

The World Data Centre for Greenhouse Gases (WDCGG)
is established under the Global Atmosphere Watch (GAW)
program to collect, archive and provide data for greenhouse
(CO2, CH4, CFCs, N2O, etc.) and related (CO, NOx,
SO2, VOC, etc.) gases and surface ozone in
the atmosphere.

The Air Management Information System (AMIS) is a set of
user-friendly databases aimed at transferring information
on air quality management (air quality management instruments
used in cities, indoor and ambient air pollutant concentrations,
noise levels, health effects, control actions, air quality
standards, emission standards, emission inventories,
dispersion modeling tools) between countries and cities,
and thus acting as a global air quality information
exchange system. A core database contains summary statistics
of air pollution data like annual means, 95-percentiles,
and the number of days on which WHO guidelines are exceeded.
AMIS 3.0, 2001 is now available on CD-ROM with data
(mostly from 1986 to 1999) from about 150 cities in
45 countries. The data are made available by the WHO
Department for the Protection of Environmental Health
to AMIS participants and also distributed to interested
non profit organizations free of charge.